Calorie Calculator: Find Your Daily Calories for Any Goal
Your daily calorie needs depend on your BMR (what you burn at rest) multiplied by your activity level, that’s your TDEE. This calorie calculator estimates your TDEE with the Mifflin-St Jeor equation, then sets your target: TDEE minus 300–500 for fat loss, TDEE plus 250–500 for muscle gain. Most moderately active adults land between 2,000 and 3,000 calories a day.
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Calorie Calculator
Find your daily calorie target based on your goal — powered by the Mifflin-St Jeor equation.
Estimate only — not medical advice. Adjust after 2–3 weeks based on real results.
How Many Calories Should You Eat? (Goal Table)
The tool below computes your TDEE first, then adjusts for your goal. Here’s what the math looks like for typical TDEEs:
| Your TDEE | Lose fat (−400) | Maintain (±0) | Gain muscle (+300) |
|---|---|---|---|
| 1,800 | 1,400 | 1,800 | 2,100 |
| 2,200 | 1,800 | 2,200 | 2,500 |
| 2,600 | 2,200 | 2,600 | 2,900 |
| 3,000 | 2,600 | 3,000 | 3,300 |
A deficit of ~500 calories a day predicts roughly 1 lb (0.45kg) of fat loss per week, since a pound of body fat stores about 3,500 calories. A surplus of 250–300 keeps muscle gains lean with minimal fat.
How This Calculator Works
Step 1, BMR via Mifflin-St Jeor. The calculator estimates your basal metabolic rate (calories burned at complete rest) from weight, height, age, and sex:
- Men: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5
- Women: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161
Mifflin-St Jeor is the equation the Academy of Nutrition and Dietetics considers most accurate for most adults.
Step 2, activity multiplier. Your BMR is multiplied by an activity factor to get TDEE (total daily energy expenditure):
| Activity level | Multiplier |
|---|---|
| Sedentary (desk job, little exercise) | × 1.2 |
| Light (1–3 workouts/week) | × 1.375 |
| Moderate (3–5 workouts/week) | × 1.55 |
| Very active (6–7 workouts/week) | × 1.725 |
| Extra active (physical job + training) | × 1.9 |
Step 3, goal adjustment. Subtract for fat loss, add for muscle gain, hold steady for maintenance.
One honest warning: most people overestimate their activity level. A desk worker who trains three times a week is “lightly active,” not “very active”, training is one hour; the other 23 are what count. When in doubt, pick the lower activity level. An underestimated TDEE just means slightly faster progress; an overestimated one means weeks of frustration wondering why the scale won’t move.
Worked Example: James, 32, 85kg, Trains 4x/Week
James is 85kg, 180cm, 32 years old, moderately active, and wants to lose fat.
- BMR = (10 × 85) + (6.25 × 180) − (5 × 32) + 5 = 850 + 1,125 − 160 + 5 = 1,820
- TDEE = 1,820 × 1.55 = 2,821
- Fat-loss target = 2,821 − 400 = ~2,420 calories/day
It would also hand him a protein target (~135–185g) to protect muscle during the cut, pair it with our protein calculator.
The Three Ways to Eat Your Number
Weight Loss: The Deficit Guide
Once you know your maintenance calories, a calorie deficit calculator takes 15 to 25 percent off that number to set your daily target.
A 300–500 calorie daily deficit is the sweet spot: fast enough to see weekly progress, small enough to sustain. Larger deficits (750–1,000) work short-term but raise hunger, fatigue, and muscle loss. Two rules make the deficit stick:
1. Hit protein (1.6–2.2g/kg), it preserves muscle and kills hunger.
2. Keep the foods big, the best foods for weight loss (lean proteins, vegetables, potatoes, oats) let you eat satisfying portions inside the deficit.
Track for 2–3 weeks, then adjust: losing 0.5–1% of body weight per week means the number is right. No movement? Drop another 150–200 calories. Losing faster than 1% per week consistently? Eat a little more, overly fast loss usually costs muscle and tanks adherence within a month.
Muscle Gain: The Surplus Guide
Eat 250–500 calories above TDEE. Beginners can use the higher end; experienced lifters should stay near +250 to limit fat gain. The surplus only builds muscle if training provides the stimulus, extra calories without progressive training just become body fat. Expect 0.25–0.5% of body weight gained per week as a good pace.
Maintenance Calories: Eating at TDEE
If you would rather not do the math yourself, a maintenance calories calculator does this TDEE estimate for you in seconds.
Maintenance is underrated, it’s where you lock in results. Eat at TDEE while training hard and you can slowly recomp: losing a little fat and gaining a little muscle simultaneously, especially as a beginner or after time off. Use the maintenance figure as your anchor for diet breaks between cutting phases.
Should You Count Every Calorie?
Not forever. Calorie counting is a measurement tool, not a lifestyle. The best approach for most people:
- Count strictly for 2–4 weeks to calibrate your eye. Most people discover their “tablespoon of peanut butter” was three, and their “light dressing” was 300 calories.
- Then switch to portion habits: palm-sized proteins, fist-sized carbs, two thumbs of fats, half-plate vegetables. These land most people within a few hundred calories of their target without an app.
- Return to counting whenever progress stalls for 3+ weeks or your goal changes.
People who track food intake, even imperfectly, tend to lose more weight than those who don’t. The mechanism isn’t magic: tracking forces honesty. But tracking every gram for years burns most people out. Use the numbers to learn, then use the habits to live.
Why Online Calculators Disagree
Different calculators use different equations (Mifflin-St Jeor vs Harris-Benedict vs Katch-McArdle) and different activity definitions. Expect ±10–15% variation between tools, that’s normal. Treat any calorie calculator result as a starting estimate, then adjust based on 2–3 weeks of real scale and measurement data. Your body’s response is the final authority.
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Frequently Asked Questions
How many calories should I eat per day?
It depends on your size, age, sex, and activity, most adults need 1,800–3,000. The calorie calculator above computes your personal TDEE and goal target.
What is the difference between a calorie calculator and a TDEE calculator?
A TDEE calculator estimates total daily energy expenditure (maintenance calories). A calorie calculator goes one step further and adjusts that number for your goal, deficit for fat loss, surplus for muscle gain.
How big a calorie deficit do I need to lose weight?
300–500 calories below TDEE per day, which predicts about 0.5–1 lb of fat loss per week. Bigger deficits work faster but are harder to sustain.
Should I eat back exercise calories?
Usually no, or only half. Fitness trackers can overestimate calorie burn by 20–40%, so “eating back” the full amount often erases the deficit.
Why am I not losing weight in a calorie deficit?
The usual causes: underestimating intake (oils, sauces, snacks, drinks), overestimating activity, or water retention masking fat loss. Track honestly for 2–3 weeks before changing the target.
Can I gain muscle and lose fat at the same time?
Yes, as a beginner, detrained lifter, or person with higher body fat, eat near maintenance with high protein (1.6–2.2g/kg) and progressive training. Advanced lean lifters generally need dedicated phases.
How accurate are TDEE estimates?
Within about ±10–15% for most people. Age, muscle mass, genetics, and daily movement (NEAT) all shift the real number. That’s why every estimate needs 2–3 weeks of real-world validation against the scale. Two people with identical stats can differ by 300+ calories of TDEE purely from how much they move outside the gym.
Do I need to hit my exact calorie target daily?
No, weekly averages matter more than daily precision. Being 200 over on Saturday and 200 under on Monday nets out. Aim to land within ±100 of target most days and let the average do the work. Perfection isn’t required; consistency is.
Sources
- USDA: Dietary Guidelines for Americans (energy balance guidance).
- NIH (PubMed): Mifflin-St Jeor validation studies; thermic effect and deficit research.
- CDC: healthy weight-loss rate guidance.
This article is for general information only and is not medical advice. Talk to a registered dietitian or your doctor about your personal nutrition needs.